How Can I Programmatically Modify a Web.config File Using C#?

Use C# (.NET) programming to modify the Web.config file

By modifying the web.config file through C# programming, developers can dynamically adjust application settings at runtime. One way is to use configuration objects.

Load Web.config into the configuration object

To load web.config into a configuration object, use the WebConfigurationManager.OpenWebConfiguration method:

<code class="language-csharp">var configuration = WebConfigurationManager.OpenWebConfiguration("~");</code>

Modify connection string

To modify the connection string, navigate to the appropriate section in the configuration object:

<code class="language-csharp">var section = (ConnectionStringsSection)configuration.GetSection("connectionStrings");</code>

Find the specific connection string you want to modify:

<code class="language-csharp">section.ConnectionStrings["MyConnectionString"];</code>

Set new connection string value:

<code class="language-csharp">section.ConnectionStrings["MyConnectionString"].ConnectionString = "Data Source=...";</code>

Save the modified Web.config

When you are done making changes, save the changes back to the web.config file:

<code class="language-csharp">configuration.Save();</code>

More examples

For more detailed examples, please refer to the following resources:

• MSDN: //m.sbmmt.com/link/2808e33b0ef26bac248b17936f0f1938
• Stack Overflow: //m.sbmmt.com/link/ea87de84e18a339d4efa00144c5b0fe3

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